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Colloid chemistry. A subdivision of physical chemistry comprising the study of phenomena characteristic of matter when one or more of its dimensions lie in the range between 1 millimicron(nanometer) and 1 micron(micrometer)... Colloidal particles... occur in various types of suspensions(imprecisely called solutions), e. g., solid/gas(aerosol), solid/solid, liquid/liquid(emulsion), gas/liquid(foam)... Macromolecules(proteins and other high polymers) are at the lower limit of this range; the upper limit is usually taken to be the point at which the particles can be resolved in an optical microscope...  3, fiche 1, Anglais, - colloidal%20particle

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colloidal particle: term usually used in the plural (colloidal particles).  4, fiche 1, Anglais, - colloidal%20particle

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Colloidal clay particle.  2, fiche 1, Anglais, - colloidal%20particle

Fiche 1,  Justifications,  Français

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Un colloïde est une dispersion de petites particules d'un matériau dans un autre (ex. sol, aérosol, émulsion). Les particules colloïdales sont des agrégats de nombreux atomes ou molécules. Leur diamètre < 500 nm (~ la longueur d'onde de la lumière visible). Elles sont trop petites pour être visibles avec un microscope optique ordinaire mais on peut les détecter par diffraction de la lumière, sédimentation ou osmose.  2, fiche 1, Français, - particule%20collo%C3%AFdale

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particule colloïdale : terme habituellement utilisé au pluriel (particules colloïdales).  3, fiche 1, Français, - particule%20collo%C3%AFdale

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Particule d'argile colloïdale.  4, fiche 1, Français, - particule%20collo%C3%AFdale

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Fiche 2,  Justifications,  Anglais

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A subdivision of physical chemistry comprising the study of phenomena characteristic of matter when one or more of its dimensions lie in the range between 1 nanometre and 1 micrometre. The science includes not only finely divided particles but also films, fibers, foams, pores, and surface irregularities. It is the dimension that is critical, rather than the nature of the material. Colloidal particles may be gaseous, liquid, or solid, and occur in various types of suspensions(imprecisely called solutions), e. g., solid/gas(aerosol), solid/solid, liquid/liquid emulsion), gas/liquid(foam). In this size range, the surface area of the particle is so much greater that its volume that unusual phenomena occur; for example, the particles do not settle out of the suspension by gravity, and are small enough to pass through filter membranes. Macromolecules(proteins and other high polymers) are at the lower limit of this range.  2, fiche 2, Anglais, - colloid%20chemistry

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Though the term is often used synonymously with surface chemistry, in a strict sense it is limited to the size range mentioned in at least one dimension, whereas surface chemistry is not.  2, fiche 2, Anglais, - colloid%20chemistry

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Fiche 3,  Justifications,  Anglais

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Aggregate. In gas cleaning, a relatively stable assembly of dry particles, formed under the influence of physical forces.(The process of aggregate formation is known as aggregation). In other contexts, the particles need not be dry. The term is used in colloid chemistry to refer specifically to the structure that results from the cohesion of colloidal particles. Aggregate formation in colloidally unstable soils is termed either coagulation(formation of a coagulum) or flocculation(formation of a floc).  1, fiche 3, Anglais, - aggregation

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L'agrégation de particules dissemblables est due à des phénomènes électrostatiques d'adsorption ou d'affinités chimiques avec dissolution partielle de constituants en phase solide ou en phase liquide solidifiée.  1, fiche 3, Français, - agr%C3%A9gation

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En français, contrairement à l'anglais, ce terme s'écrit avec un seul «g».  2, fiche 3, Français, - agr%C3%A9gation

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